The uniquely characteristic macrostructures of binary hydrogen-clathrate compounds MH_n formed at high pressure, a cage of hydrogens surrounding a central-atom host, is theoretically predicted in various studies to include structurally stable phonon-mediated superconductors. High superconductive transition temperatures T_C have thus far been measured for syntheses with M = La, Y, and Th. In compressed LaH₁₀, independent studies report T_C of 250 K and over 260 K, a maximum in T_C with pressure P, and normal-state resistance scaling with temperature (suggesting unconventional pairing). According to reported band structure calculations of Fm\( \overline{3} \)m-phase LaH₁₀, the La is anionic, with the chemical valence electrons appearing evenly split between La and H₁₀. Thus, compressed LaH₁₀ contains the combination of structure, charge separation, and optimal balanced allocation of valence electrons for supporting unconventional high-T_C superconductivity mediated by Coulomb interactions between electronic charges associated with La and H₁₀. A general expression for the optimal superconducting transition temperature for MH_n clathrates is derived as T_C0 = k_B⁻¹Λ[(n + v)/2A]^1/2e²/ζ, where Λ is a universal constant, (n + v) is the chemical valence sum per formula unit, taking unity for H and v for atom M, A is the surface area of the H-polyhedron cage, and ζ is the mean distance between the M site and the centroids of the polyhedron faces. Applied to Fm\( \overline{3} \)m LaH₁₀, T_C0 values of 249.8(1.3) K and 260.7(2.0) K are found for the two experiments. Associated attributes of charge allocation, structure, effective Coulomb potential, and H-D isotope effect in T_C of Fm\( \overline{3} \)m LaH₁₀ and Im\( \overline{3} \)m H₃S are discussed, along with a generalized prospective for Coulomb-mediated superconductivity in MH_n.

在各种研究中理论上预测，在高压下形成的二元氢clathrate化合物M H _n的独特特征宏观结构，即围绕中心原子主体的氢的笼子，包括结构稳定的声子介导的超导体。迄今为止，已经针对M  ＝ La，Y和Th的合成测量了高超导转变温度T _C。在压缩的LaH _10中，独立研究报告的T _C为250 K和超过260 K，在压力P的情况下T _C的最大值，以及正常状态下的电阻随温度变化（建议采用非常规配对）。根据Fm \（\ overline {3} \）m相LaH _10的能带结构计算，La是阴离子的，化学价电子在La和H ₁₀之间均匀分布。因此，压缩的LaH ₁₀包含结构，电荷分离和价电子的最佳平衡分配的组合，以支持由与La和H ₁₀相关的电荷之间的库仑相互作用介导的非常规的高T _C超导性。M的最佳超导转变温度的一般表达式ħ _Ñ包合物被推导为Ť _C0  =  ķ_乙^-1 Λ[（N +  v）/ 2甲] ^1/2 ë ² /ζ，其中Λ是一种通用的恒定，第（n +  v）为每化学化合价之和式单元，以用于h统一和v为原子中号，阿是H-多面体笼的表面积，和ζ是之间的平均距离中号位点和多面体面的质心。应用于Fm \（\ overline {3} \）m LaH ₁₀，T _C0这两个实验的值分别为249.8（1.3）K和260.7（2.0）K。讨论了Fm \（\ overline {3} \）m LaH ₁₀和Im \（\ overline {3} \）m H ₃ S的T _C中的电荷分配，结构，有效库仑势和HD同位素效应的相关属性，以及M H _n中库仑介导的超导性的广义预期。